[all-commits] [llvm/llvm-project] aa4777: AMDGPU: Mark the SCC def dead in the waterfall loo...

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/amdgpu/waterfall-loop-dead-scc
  Home:   https://github.com/llvm/llvm-project
  Commit: aa4777ca6314d82e775fc4ca78361f858e47d4d4
      https://github.com/llvm/llvm-project/commit/aa4777ca6314d82e775fc4ca78361f858e47d4d4
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2026-09-24 (Thu, 24 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.buffer.load.format.f16.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.buffer.load.format.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.buffer.load.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.buffer.store.format.f16.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.buffer.store.format.f32.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.buffer.store.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.ptr.buffer.load.format.f16.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.ptr.buffer.load.format.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.ptr.buffer.load.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.ptr.buffer.store.format.f16.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.ptr.buffer.store.format.f32.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.ptr.buffer.store.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.ptr.tbuffer.load.f16.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.ptr.tbuffer.load.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.ptr.tbuffer.store.f16.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.ptr.tbuffer.store.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.tbuffer.load.f16.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.tbuffer.load.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.tbuffer.store.f16.ll
    M llvm/test/CodeGen/AMDGPU/legalize-amdgcn.raw.tbuffer.store.ll
    M llvm/test/CodeGen/AMDGPU/legalize-soffset-mbuf.ll
    M llvm/test/CodeGen/AMDGPU/move-to-valu-vimage-vsample.ll
    M llvm/test/CodeGen/AMDGPU/mubuf-legalize-operands.mir

  Log Message:
  -----------
  AMDGPU: Mark the SCC def dead in the waterfall loop expansion

The exec-mask manipulation in emitLoadScalarOpsFromVGPRLoop clobbers SCC,
but nothing in the generated loop reads it. Avoid depending on later fresh
computation of dead flags.

Co-Authored-By: Claude Opus 5 <noreply at anthropic.com>



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